I've never heard of a witch battery, but if you mean to ask how you can store energy in things for later, you can do so by simply focusing your energy into an object. There's no need to make horcruxes here! But if you use crystals, you'll want to do so with ones that have high vibrations, and/or are very receptive to energies. Keep it separate from the rest of your collection to prevent the energies from getting muddled up.